Senior Python Engineer

Ascendion; Bengaluru; On-site; INR 4,000,000 - 7,000,000; Full time

Job summary

Ascendion seeks a Senior Python Developer to design, build, and own scalable backend services and APIs using Python and FastAPI. You will drive backend architecture, implement microservices, and collaborate across product, frontend, DevOps, QA, and security teams in a cloud-native, hybrid environment in Bangalore.

You should have 12–15 years of professional software experience, strong Python backend skills, and hands-on experience with REST APIs, data models, caching, and CI/CD pipelines.

Qualifications

• 12–15 years of professional software engineering experience.
• Strong hands‑on expertise in Python backend development.
• Proven experience building production‑grade applications using FastAPI or similar Python frameworks.
• Strong understanding of backend architecture, REST APIs, microservices, and distributed systems.
• Experience designing scalable platform services and reusable backend components.
• Strong experience with relational/NoSQL databases, Redis, caching, API security, testing, and performance tuning.
• Working knowledge of containers, GitLab pipelines/CI-CD, observability, and cloud-native engineering.
• Experience with Datadog or similar observability platforms.
• Azure experience, particularly Azure Container Apps and Azure Blob Storage, is desirable.
• Experience owning technical decisions and architecture for complex backend systems.
• Demonstrated experience using GitHub Copilot to improve engineering productivity and code quality.
• Strong Agile experience with excellent communication, collaboration, and mentoring skills.

Responsibilities

• Design and develop scalable backend services and RESTful APIs using Python and FastAPI.
• Own backend architecture, technical design, and implementation of complex systems.
• Design and consume APIs using OpenAPI/Swagger specifications.
• Build reusable backend components, platform services, and integration capabilities.
• Design efficient data models and access patterns across relational and NoSQL databases.
• Implement caching, API security, performance optimization, and distributed system patterns.
• Collaborate with product, frontend, QA, DevOps, platform, and security teams.
• Troubleshoot production issues and conduct root‑cause analysis.
• Develop unit, integration, and API test suites.
• Establish coding standards, engineering best practices, and CI quality gates.
• Participate in architecture reviews, technical design discussions, and refinements.
• Work with containers, GitLab CI/CD pipelines, observability tools, and cloud-native technologies.

Skills

Python backend development

FastAPI

REST APIs

Microservices

Distributed systems

Relational/NoSQL databases

Caching/Redis

API security

Testing & QA automation

Performance optimization

Containers

GitLab CI/CD

Observability (Datadog)

Cloud-native engineering

Azure (Container Apps/Blob)

GitHub Copilot

AgileMentorship

Tools

Datadog

GitLab CI/CD

Azure Container Apps

Azure Blob Storage

OpenAPI/Swagger

Job description

Job Description:

About Ascendion

Ascendion is a leader in AI-Native platform driven software engineering company that underwrites outcomes, helping businesses innovate faster, smarter, and with greater impact. We partner with Global 2000 clients across North America, UK, Europe, and APAC to solve complex challenges in data, experience design, software product engineering, and workforce transformation. Powered by expert engineers, thousands of AI agents, and our Engineering to the Power of AI™ (EngineeringAI) method, we deliver measurable outcomes that build trust, unlock value, and accelerate growth. Learn more at ascendion.com

Ascendion | Engineering to elevate life

We have a culture built on opportunity, inclusion, and a spirit of partnership. Come, change the world with us:

• Build the coolest tech for world’s leading brands
• Solve complex problems – and learn new skills
• Experience the power of transforming digital engineering for Fortune 500 clients
• Master your craft with leading training programs and hands‑on experience

Experience a community of change makers!

Join a culture of high-performing innovators with endless ideas and a passion for tech. Our culture is the fabric of our company, and it is what makes us unique and diverse. The way we share ideas, learning, experiences, successes, and joy allows everyone to be their best at Ascendion.

Job Title: Senior Python Developer

About The Role

• Senior Python Backend Engineer responsible for designing, developing, and owning scalable, high-performance backend services and APIs. The role focuses on Python/FastAPI development, backend architecture, microservices, distributed systems, and cloud-native engineering. The candidate will drive technical decisions, build reusable platform capabilities, ensure high engineering quality, and collaborate across product, frontend, DevOps, QA, security, and platform teams.
• Key Responsibilities
• Design and develop scalable backend services and RESTful APIs using Python and FastAPI.
• Own backend architecture, technical design, and implementation of complex systems.
• Design and consume APIs using OpenAPI/Swagger specifications.
• Build reusable backend components, platform services, and integration capabilities.
• Design efficient data models and access patterns across relational and NoSQL databases.
• Implement caching, API security, performance optimization, and distributed system patterns.
• Collaborate with product, frontend, QA, DevOps, platform, and security teams.
• Troubleshoot production issues and conduct root‑cause analysis.
• Develop unit, integration, and API test suites.
• Establish coding standards, engineering best practices, and CI quality gates.
• Participate in architecture reviews, technical design discussions, and refinements.
• Work with containers, GitLab CI/CD pipelines, observability tools, and cloud-native technologies.
• Leverage GitHub Copilot for development, refactoring, testing, documentation, and productivity.
• Mentor engineers and provide technical guidance on complex backend solutions.
• Minimum Qualifications
• 12–15 years of professional software engineering experience.
• Strong hands‑on expertise in Python backend development.
• Proven experience building production‑grade applications using FastAPI or similar Python frameworks.
• Strong understanding of backend architecture, REST APIs, microservices, and distributed systems.
• Experience designing scalable platform services and reusable backend components.
• Strong experience with relational/NoSQL databases, Redis, caching, API security, testing, and performance tuning.
• Working knowledge of containers, GitLab pipelines/CI-CD, observability, and cloud-native engineering.
• Experience with Datadog or similar observability platforms.
• Azure experience, particularly Azure Container Apps and Azure Blob Storage, is desirable.
• Experience owning technical decisions and architecture for complex backend systems.
• Demonstrated experience using GitHub Copilot to improve engineering productivity and code quality.
• Strong Agile experience with excellent communication, collaboration, and mentoring skills.

Location

Bangalore (Hybrid)

Requirements: